Manufacture of hollow glass articles.



` No. 694,685. Patentdvmar. 4. |902.

P. TjslEvl-:RL MANU'FAGTURE 0F HOLLOW GLASS ARTICLES.

(Application filed Jung 8,-1901.\ I (No Model.)

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. UNITED ZSTATES 4PAUL TIIEODOR SIEVERT PATENT FFIC.

,i oF DRESDEN, GERMANY.

MAN UIFVACTU RE oF- HoLLowe I 'Ass ARTICLES.

sPEcxFIcA'rIoN forming part' of Letters Patent No. 694,685, dated March4, 1902. Application ined rute a, 1901. seria No. 63,713. (No man.)

- ing is a specification.

In practice the production of hollow glass articles according to thepresent'invention begins with the spreading of a layer of mol- .tenglass upon any suitable support, which support is preferably reversible.Upon this layer of glass, while still remaining in a softened or plasticcondition by the retentionr vof a portion of the heat of fusion, ashaping frame,- ring, or rim'is laid and pressed. The support, with theglass layer'and the shapingring, is then turned over, and the glasslayer is freed from the support and left suspended by its edges from thering or frame. -The lglass layer, which lnow sinks and sagsinside theframe by reason of its viscous glowing state, forms itself into a hollowarticle which assumes of its own accord the basin-shaped form, which isdetermined by the shape of the frame as regards its open end and asregards the thickness of wall and depth by the sagging of the glass, incombination with the shape of theframe. In this manner hollow glassarticles of certain form' may be prof duced complete without a mold andwithout the application of pressure, (whether produced by blowingorotherwise.) Molds, however, may be employed in the production of thesearticles, into which molds the glass bag hanging from the frame isallowed to sag and settle itself against the walls thereof and bycontact with the said walls receive a definite form without theassistance of internal pressure.

It is to be remarked lthat previously-manufactured sheets of glass havebeen already view of the process forming the object of the presentinvention, in that there is a second heating of the glass sheets, andthe frame, ring, or rim being repeatedly exposed to heat will soonbecome destroyed and'unfit for use. In the accompanying drawings,Figures l, 2, 2, 3, 3, 4, 5 represent in vertical section 'apparatus bythe use of which my improved process has been practically performed.

Fig.' l represents the` plate or support ct, hereinbeforementioned,having poured out upon it a sufficient quantity of moltenglass b to form the hollowarticle desired. Fig. 2 shows said plate withthe glass h spread out upon it into a uniform fiat layer and with theframe, rim, or ring c before mentioned placed upon said layer and havingits edges pressed thereinto. The plate a is represented as' providedwith a handle 8 and the frame, rim, or 'ring c as provided withphandles9 9.

Fig-3 shows the plate a and frame, ring, or rim c inverted together andsupported by the handles 9 9, resting upon stationary supports e e, andshows the glass layer h as beginning to sag or sink within the frame forthe formation of the desired hollow article.

Fig. 4 represents theframe, rim, or ring c remainingonv the supports e ewithout the Y plate a,"the`latter having been removed. The AYglaSS'Z?,retained in a plastic state by the remaining heatof fusion andhangingWithin c, from the edges thereof, gradually assumes by its weight adeeper and deeper bowl-like form until by cooling it has ceased to beplastic.

dicated in dotted outline.

Fig. 5 illustrates the carrying out of the process by the employment ofa mold j", open at the top. This mold has its interior cavity of a formthe counterpart of that desired for the exterior of the hollow articleto be produced. The frame, rim, or ring c, with the glass dependentVVfrom and within its edges, being placedu'pon the edges of the saidmold and thereon supported the plastic glass sags or sinks by its ownweight within the mold until by coming to rest again'stvthe interiorthereof it receives the desired shape. Y

Figs. 2fL and 3 illustrate a modification of the frame c, which is madewith an internal The form which it may finally receive is in-v4 groovecl running all around it for the purpose of holding the edges of thespread layer b of glass. For the use of this holding-frame c the platea, is made without the surrounding upwardly-projecting rim shown upon itin Figs. l, 2, and 3, and in such use the said frame is placed upon theplate a before the pouring of the molten glass upon the latter, and thenthe molten glass is poured within the said frame.

What I claim as my invention is l. The process herein described for theproduction of hollow glass articles from liquid glass, consisting inspreading out the liquid glass in a sheet-like flatlayer, holding thesospread layer on outlines corresponding with the surrounding outlinesof the hollow article to be produced while those parts of said layerincluded within said outlines are unsupported from beneath, and allowingthe so-included parts, while remaining plastic by the retention of aportion ofthe heat of fusion, to shape themselves by their own weight,substantially as herein described.

2. The process herein described for the molding of hollow glass articlesof a desired shape consisting in spreading out liquid glass in asheetlike layer and holdin gthe so-spread layer on outlinescorresponding with the surrounding outlines of the hollow article to bemolded while those parts of said layer included within said outlines,while remaining plastic by theA retention of a portion of the heat offusion, mold themselves into the desired shape by their own weight,substantially as herein described.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses, this 25th day of May, 1901.

PAUL TI-IEODOR SIEVER'I.

Witnesses:

HERNANDO DE SoTo, PAUL ARRAS.

